Jump to main content
Jump to site search

Issue 15, 2017
Previous Article Next Article

Internal structure and phase transition behavior of stimuli-responsive microgels in PEG melts

Author affiliations

Abstract

In this work we investigated the behaviour of stimuli-responsive poly(N-vinylcaprolactam) (PVCL) microgels in poly(ethylene glycol) (PEGs) with a linear architecture. We performed small-angle neutron scattering (SANS) experiments at two different microgel concentrations and various temperatures. The results were compared with those on PVCL microgels in water. PVCL in PEG (molecular weight MW = 2 kg mol−1) exhibits a volume phase transition temperature (VPTT) at a temperature between 160 and 180 °C. The diameter of the swollen microgel is only slightly smaller than in water. Furthermore, with increasing molecular weight of the surrounding polymer matrices fewer chains penetrate the microgel particles. In agreement with that, we identify a decreasing diameter with increasing molecular weight. In the short chain polymers up to MW = 3 kg mol−1, PVCL is well dispersed in the matrices with only minor signatures of agglomeration. For the well dispersed systems, we find unperturbed chain conformation of the PEG. Our results clearly show that the miscibility of PVCL and PEG disappears in a molecular weight range of 3 to 10 kg mol−1.

Graphical abstract: Internal structure and phase transition behavior of stimuli-responsive microgels in PEG melts

Back to tab navigation

Supplementary files

Article information


Submitted
06 Nov 2016
Accepted
14 Feb 2017
First published
14 Feb 2017

Soft Matter, 2017,13, 2738-2748
Article type
Paper

Internal structure and phase transition behavior of stimuli-responsive microgels in PEG melts

F. Schneider, A. Balaceanu, Z. Di, Y. B. Melnichenko, J. Allgaier, A. Pich, G. J. Schneider and D. Richter, Soft Matter, 2017, 13, 2738
DOI: 10.1039/C6SM02501C

Social activity

Search articles by author

Spotlight

Advertisements